Differential response of tossa jute (Corchorus olitorius) submitted to water deficit stress

Drought-tolerant crops with high nutritional value such as amaranth leafy vegetables have the potential to improve the diet of rural communities in dry semi-arid areas of southern Mozambique. A study was conducted aiming to assess the vegetative growth and leaf nutritional content of Amaranthus hybridus and A. tricolor when subjected to different watering regimes (80%, 50% and 20% of total available water) during the rainy and dry seasons, and ascertain the relationship between temperature and day length affecting the leaf yield of the two species. Six field trials were conducted in a randomised complete block design with 2 × 3 factorial layout with six replications in Maputo. Vegetative growth was sensitive to soil water at 50% and 20% of available water. However, the leaf and side-shoot number, leaf area and yield were less sensitive to short-interval water deficits during the rainy season. Leaf calcium and crude protein contents were higher at low water levels. Leaf yield was significantly affected by ...

Vegetative growth of Amaranthus hybridus and Amaranthus tricolor under different watering regimes in different seasons in southern Mozambique

The reactive influences of pre-sowing He-Ne laser seed irradiation and drought stress on growth, fatty acids, phenolic ingredients, and antioxidant properties of Celosia argentea

In physiologically young plants (Solanum tuberosum L., cv. Sebago), abscisic acid (ABA) and chlorethyltrimethylammonium chloride (CCC) promoted tuberization at day/night temperatures of 32°/18°C, but not at 32°/28°C, in contrast to earlier experiments with physiologically old plants. Disbudding promoted tuberization at both temperatures. These results suggest that physiologically young plants have a greater capacity for increased gibberelling synthesis in the buds at high temperatures.

Tuberization in potato at high temperatures: response of physiologically young plants to disbudding and growth inhibitors

Response to water stress of Celosia argentea and Corchorus olitorius in controlled environments

Influence of temperature on the growth of Solanum nigrum and Amaranthus hybridus

SummaryControlled environment experiments were conducted to evaluate the responses of Amaranthus hybridus cv Green Head and of Ceiosia argentea cv HTA (SRV8), tropical leafy vegetables, to photosynthetically active radiation (PAR) of 215, 325 and 400 μmol photons m-2 s-1 with harvests at 7, 14, 21 and 28 days from emergence. Leaf, stem and root dry weights and leaf area increased with increasing PAR in both species. Root lengths were not much affected by PAR level. Cv Green Head was more responsive to increasing PAR than cv UTA but a major part of the increased plant weight was stem tissue. The largest plants were Green Head at the highest PAR level as a result of both greater leaf area and higher net assimilation rate up to 21 days.

A. M. Eastham

Papers

Response to water stress of Celosia argentea and Corchorus olitorius in controlled environments

Influence of temperature on the growth of Solanum nigrum and Amaranthus hybridus

Effects of levels of photosynthetically active radiation on the growth of Amaranthus hybridus and Celosia argentea.